Tungsten has 74 electrons!!
iron has 4 shells because there are 30 electrons.
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More the number of shells in an atom, more away will be the electrons from the nucleus. Hence, weaker will be the attraction between nucleus and outermost electrons. So atom with more shells will let go their electrons easier than atoms with fewer shells.
Mercury has 80 electrons which means there are 6 shells in a neutral atom of mercury.
Berkelium has 97 electrons, which means it has 7 electron shells.
1
A neutral xenon atom has 54 electrons. Two of its electron shells would be completely filled, with 2 and 8 electrons, leaving 44 electrons in the remaining electron shells.
Uranium has 92 electrons, which means it has 7 electron shells.
Calcium has 20 electrons in its electronic configuration, therefore it has 20 shells.
Hydrogen has only one valence electrons.
There are 4 shells in 20 electrons: 2 electrons in the first shell, 8 in the second, 8 in the third, and 2 in the fourth shell.
Beryllium has one outer electron shell with two electrons.